Not this year but years ago I cried as soon as I hit the car after dropping youngest off. Remember it’s not just because your kid is out of the house but also a huge transition for you. All of a sudden it feels like half the reason of your life has ended. It’s hard when babies enter your life and hard when they leave!
But give it time–you’ll find some new routines that don’t revolve around your kids and the relationship with your kids when it becomes more adult-adult is very fulfilling.